The ciliates are a chilodonellid with a big bare patch on the ventral surface, either Pseudochilodonopsis or Chilodonella. I think you'd want a closer view of the suture kinety/kineties (the horizontal line/lines of cilia just anterior of the "mouth") to rule out one genus or the other._________________It Came from the Pond (Blog): http://www.itcamefromthepond.com/